| for an inductive two-terminal element with terminals A and B, derivative of the linked flux Ψ between the terminals with respect to the electric current i in the element:
where the sign of the linked flux is determined by taking the voltage, in the time integral defining it, as the difference of the electric potentials at A and B, and where the current is taken as positive if its direction is from A to B and negative in the opposite case
NOTE – For an ideal inductor, the differential inductance Ld is equal to its inductance L.
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